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Machine Elements – Coordination with Design Science

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Machine Elements – Coordination with Design Science AEDS 2005 WORKSHOP 3 – 4 November 2005, Pilsen - Czech Republic MACHINE ELEMENTS – COORDINATION WITH DESIGN SCIENCE W. Ernst Eder Keywords: Machine element, function structure, organ structure, constructional part 1. Introduction This paper is a continuation of a paper delivered in 2004 [Eder 2004]. Machine elements has long been a staple subject for mechanical engineering education, and an extensive literature exists, e.g. [Doughtie 1964, Faires 1965, Spotts 1985, Juvinall 2000]. Nevertheless, there is a general lack of a systematic classification, the literature presents partly-ordered listings, examples of existing machine elements, and extensive engineering science analysis, with little attempt at revealing the underlying principles. Such a classification would be useful in the context of design engineering. For teaching engineering, it provides an ‘advanced organizer’ for the information about machine elements [Bruner 1960 and 1966], as a pedagogic aid to help students build that information into their own mental schemata [Eder 2005a and 2005b]. It also provides a basis for applying machine elements to solve problems of design engineering. Technical Systems are tangible products of an enterprise that have a substantial engineering content. They are intended to be used, as operators of a transformation process, see figure 1, working together with the other operators. Figure 1 General Model of a Transformation System Figure 1 shows a generalized model of a transformation system (TrfS), with its processes (TrfP) and their technologies (Tg), its operators: human systems (HuS), technical systems (TS), information systems (IS), management systems (MgtS), and environment systems (EnvS). Inputs to the transformation system include the operands that are to be transformed in the process from their initial state (Od1), assisting inputs (to the process, and to the operators), and secondary inputs (mostly disturbances). Outputs from the transformation system include the operands in their ending state (Od2), achieving this state Od2 of the operands (obtaining the change of properties of operands) is the intended purpose of the transformation. Outputs of the TrfS also include the secondary outputs (including those from the operators), some of which can be beneficial, some can be re-used for other purposes, and some are disturbances, pollutants, and other negative influences on the active (and general) environment. Feedback usually exists from outputs (measurements, comparisons with desired outcomes) to inputs to adjust the outputs closer to the desired states. For our purposes, the TS is the operator of interest. The TS needs to be capable of performing a given task, a purpose function [Hubka 2001], and therefore needs its specific TS-internal functions. The TS should have been designed and manufactured to be suitable for this purpose, it should be in a state of ‘operating’ or ‘being operated’ (e.g. by a human), and the operand must be present. It must usually be designed so that it can perform its duties, to deliver the necessary effects to transform the operand, the TS-trans-boundary functions. Four degrees of complexity of TS have been defined [Hubka 1996], compare figure 2: Complexity level IV – plant; Complexity level III – self-contained functioning system (machine); Complexity level II – sub-system (sub-assembly, module); Complexity level I – constructional part. Figure 2 Levels of Complexity of Technical Systems 2. Structures and their Significance Several structures of technical systems have been identified in Engineering Design Science [Hubka 1996], as useful for design engineering, especially in conceptualizing novel or innovative systems. The most important of these structures are: the function structure, the organ structure, and the constructional structure. Every technical system carries all of these structures, whether they have been deliberately designed or not. The structures can easily be recognized by a knowledgeable person. Each such structure is composed of elements (functions, organs or constructional parts respectively) and their relationships within the system and across its boundaries, see figure 3. Each structure can consist of various kinds of the appropriate elements, typically as shown in figures 4 and 5 for functions and organs respectively. The typical structures for constructional parts may be found in the usual layout, detail and assembly drawings (or their computer- resident representations), they are so well known that no further definition is needed. The detail drawings show the elemental design properties, see figure 6, of form, material, kind of manufacturing, dimension, tolerance, surface condition, etc. Assembly drawings show the structures, and reveal the design characteristics such as action sites, mode of action, mode of adjustment, etc. The general design properties are shown in the design report that records Figure 3 Structures of Technical Systems – Part A: Principles Figure 3 Structures of Technical Systems – Part B: Examples the estimations, calculations and simulations used to predict the behavior of the future TS. The external properties are generated by designing the internal properties. Knowing these kinds of elements and their properties, engineering designers can use them as check-lists to verify that their considerations are as complete as possible at that stage of designing. Figure 4 Model of the Function Structure of Technical Systems The different structures are, of course, related: (1) TS-internal functions are recognized from the effects that the TS is intended to exert on the operand of the transformation process, and describe the TS-internal and cross- boundary action capabilities of a TS [Hubka 2001]. ; (2) organs (and their structure) realize the needed functions (and their structure), they generally are connections between action locations, where constructional parts act on one another by means of a mode of action; and (3) organs are embodied in the constructional parts (and their structure). This sequence of structures can be significant for design engineering, see section 4 of this paper. The relationship between organs and constructional parts is complicated. Some sections of the boundary of a physical constructional part will constitute a part of the action locality contained in a particular organ (e.g. the bearing diameter and shoulder of a shaft). The mating action locality that completes the organ will exist on another constructional part. The form of that action locality depends on the function needed at the organ. Others sections of the constructional part will not be restrained by TS-functions, e.g. manufactured surfaces of constructional parts that are only in contact with a non-functional environment (e.g. air), the forms of these sections may be chosen according to other criteria. Figure 5 Model of the Organ Structure of Technical Systems The relationship between organ structures and constructional structures is also complicated. Referring to the representation shown in figure 3, part 2, left column, if both diagrams of structures are complete, the nodes in the organ structure represent individual organs, and the arcs represent connecting organs. The organs are embodied by arcs in the constructional structure, and the connecting organs are embodied in the constructional parts which are represented as the nodes in the constructional structure. For design engineering, and consequently for education, a good formulation of the elements is useful. Functions should be defined in words as a combination of a verb (or verb phrase) and a noun (or noun phrase) that describe what change to which property takes place (or is intended). Organs are selected to perform a function, and should be defined in words and/or diagrams that show which (intended) constructional part interacts with which other part. Constructional parts are designed to carry and connect organs, and should be defined in words, symbols (including numbers), graphical representations, etc. that show the elemental design properties of form, dimension, material, type of manufacturing, tolerance, surface quality, etc., see figure 6 Figure 6 Classes of Properties of Technical Systems 3. Classification of Machine Elements Machine elements are conventionally defined as technical systems of lower complexity (levels I and II) that are frequently used as known and proven solutions for functions in technical systems. They are mostly regarded as mechanical engineering items [Doughtie 1964, Faires 1965, Spotts 1985, Juvinall 2000]. Sub-dividing machine elements according to their complexity leads to one form of categorization. One category of simple machine elements consists of elemental organs. Many of these elemental organs constitute ‘machine elements’ in the conventional literature, e.g. press fits, splines and serrations, sliding bearings, friction faces, etc. Each such elemental organ usually consists of a pairing of the action locations existing on two interacting constructional parts. The second category of simple machine elements provides connections among the action locations on an individual constructional part, fulfills the connecting and supporting functions, provides the connecting and supporting organs to the elemental organs, and embodies the connecting organs and functions, e.g. shafts, gaskets, springs, belts and chains (the sections between contact points), etc. Such machine elements appear as individual constructional parts – complexity level I. Their general design properties are probably the
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